中国地壳运动观测网络数据处理与分析

Data processing and analysis of the crustal movement observation network in China

为了解中国地壳运动观测网络数据中心数据处理 ,特别是 GPS(全球卫星定位系统 )数据处理 ,首先简要介绍中国地壳运动观测网络的观测系统及网络的数据中心。较为全面地概述了数据中心的数据流程 ,获取地壳运动信息的 GPS数据处理方法与软件 ,讨论了数据处理中解算结果的选取、精度分析、位移与应变分析、位移时间序列分析等。较详细分析了 1 998年 9月初至1 999年 1 1月底基准网地壳运动 ,包括各基准站位移与网内各部分的应变及基准网每周计算结果时间序列。表明在所述观测期间 ,我国东部地区相对较为稳定 ;相对东部的西南地区以向北运动为主 ,并受到 NNE向挤压 ;西北地区以向北西运动为主 ;而云南地区以向南运动为主。我国中部南北地震带则是一强烈的剪切变形带。观测结果表明 ,印度板块向北挤压依然是影响我国地壳运动的主要因素。

Data processing at the center for the Crustal Movement Obse rvation Net work of China is introduced in this paper, with the emphasis on the GPS (Global Positioning System) data processing. Therefore the observation system of the pro ject and the data center are introduced at first. Data stream, methods and softw are used at the data center in GPS data processing for crustal movement are desc ribed in detail. Selection of solutions, estimation of accuracy, analysis of dis placements, strain and time series of displacement is discussed. The results of crustal movement obtained from fiducial network from Sep. 1998 to Nov. 1999 are analyzed as well as the displacement of various fiducial stations, strains in di fferent parts of the network and the time series of displacements of weekly solu tions of the fiducial stations. During this period, the crustal movement in the eastern part of China is relatively small and stable; in relation to the eastern part of China the southwestern part moves northeastward and is compressed in NN E direction; the northwestern part moves northwestward, and the Yunnan region mo ves southward. The North-south Seismic Belt in the middle part of China is a be l t of strong shear deformation. The result shows that the northward push by the I ndian Plate has played the dominant role in the crustal movement in China′s mai nland.